<template>
  <header class="header">
    <h1>todos</h1>
    <input
      id="toggle-all"
      class="toggle-all"
      type="checkbox"
      v-model="isAll"
    >
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      @keydown.enter="downFn"
      v-model="task"
    />
  </header>
</template>

<script>
export default {
  data () {
    return {
      task: ''
    }

  },
  methods: {
    downFn () {
      this.$emit('create', this.task)
      this.task = ''
    }
  },
  computed: {
    isAll: {
      set (checked) {
        this.arr.forEach(obj => obj.isDone = checked)


      },
      get () {
        return this.arr.length != 0 && this.arr.every(obj => obj.isDone === true)

      }
    }
  },
  props: ['arr']

}
</script>